Fix a crash in incognito mode when clicking the wrench menu.

chrome/browser/sync/sync_status_ui_helper.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifdef CHROME_PERSONALIZATION
 
 #include "chrome/browser/sync/sync_status_ui_helper.h"
 
 #include "app/l10n_util.h"
 #include "base/string_util.h"
@@ skipping 45 matching lines @@
   return l10n_util::GetStringF(IDS_SYNC_ACCOUNT_SYNCED_TO_USER_WITH_TIME,
                                user_name, service->GetLastSyncedTimeString());
 }
 
 // static
 SyncStatusUIHelper::MessageType SyncStatusUIHelper::GetLabels(
     ProfileSyncService* service, std::wstring* status_label,
     std::wstring* link_label) {
   MessageType result_type(SYNCED);
 
+  if (!service) {
+    return PRE_SYNCED;
+  }
+
   if (service->HasSyncSetupCompleted()) {
     ProfileSyncService::Status status(service->QueryDetailedSyncStatus());
     AuthErrorState auth_error(service->GetAuthErrorState());
 
     // Either show auth error information with a link to re-login, auth in prog,
     // or note that everything is OK with the last synced time.
     if (status.authenticated) {
       // Everything is peachy.
       status_label->assign(GetSyncedStateStatusLabel(service));
       DCHECK_EQ(auth_error, AUTH_ERROR_NONE);
@@ skipping 28 matching lines @@
       result_type = SYNC_ERROR;
       status_label->assign(l10n_util::GetString(IDS_SYNC_SETUP_ERROR));
     } else {
       status_label->assign(l10n_util::GetString(IDS_SYNC_NOT_SET_UP_INFO));
     }
   }
   return result_type;
 }
 
 #endif  // CHROME_PERSONALIZATION